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Increased state 4 mitochondrial respiration and swelling in early post‐ischemic reperfusion of rat heart
Author(s) -
Bosetti F,
Baracca A,
Lenaz G,
Solaini G
Publication year - 2004
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(04)00294-7
Subject(s) - respiration , mitochondrion , swelling , chemistry , medicine , cardiology , biochemistry , anatomy , pathology
Isolated rat hearts were exposed to 30 min ischemia or to 30 min ischemia followed by 2, 5 or 40 min reperfusion and mitochondria were isolated at these different time points. ADP‐stimulated, succinate‐dependent respiration rate (state 3) was not significantly changed at the different time points examined. In contrast, state 4 (non‐ADP‐stimulated) respiration rate was significantly increased after 30 min ischemia, and it increased further during the first post‐ischemic reperfusion period. Mitochondrial swelling, as evaluated under conditions of the major controlled ion channels (i.e. permeability transition pore and ATP‐dependent mitochondrial K + channel) closed, significantly increased in parallel. It is suggested that the inner mitochondrial membrane permeability is increased under exposure of the heart to ischemia and early reperfusion, and that the phenomenon is reversible upon subsequent long periods of reperfusion.